<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="1" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

    <el-form label-width="120px">

        <el-form-item label="课程标题">
          <el-input v-model="courseInfo.title" placeholder="示例：从基础搭建到项目工程..,注意大小写的书写 "/>
        </el-form-item>
        <!-- 所属分类 TODO -->
        <el-form-item label="课程分类">
          <el-select
            v-model="courseInfo.subjectParentId"
            placeholder="一级分类" @change="subjectLevelOneChanged">
            <el-option
              v-for="subject in subjectOneList"
              :key="subject.id"
              :label="subject.title"
              :value="subject.id"/>
          </el-select>
          <!-- 二级分类 -->
          <el-select v-model="courseInfo.subjectId" placeholder="二级分类">
            <el-option
              v-for="subject in subjectTwoList"
              :key="subject.id"
              :label="subject.title"
              :value="subject.id"/>
          </el-select>
        </el-form-item>

        <!-- 课程讲师 TODO -->
        <!-- 课程讲师 -->
        <el-form-item label="课程讲师">
          <el-select
            v-model="courseInfo.teacherId"
            placeholder="请选择">
            <el-option
              v-for="teacher in teacherList"
              :key="teacher.id"
              :label="teacher.name"
              :value="teacher.id"/>
          </el-select>
        </el-form-item>

        <el-form-item label="总课时">
          <el-input-number :min="0" v-model="courseInfo.lessonNum" controls-position="right" placeholder="请填写课程的总课时数"/>
        </el-form-item>

        <!-- 课程简介 TODO -->
        <el-form-item label="课程简介">
          <el-input v-model="courseInfo.description" placeholder=" "/>
        </el-form-item>
        <!-- 课程简介-->
        <!-- <el-form-item label="课程简介">
            <tinymce :height="300" v-model="courseInfo.description"/>
        </el-form-item> -->



        <!-- 课程封面 TODO -->
        <!-- 课程封面-->
        <el-form-item label="课程封面">

          <el-upload
            :show-file-list="false"
            :on-success="handleAvatarSuccess"
            :before-upload="beforeAvatarUpload"
            :action="BASE_API+'/eduoss/fileoss'"
            class="avatar-uploader">
            <img :src="courseInfo.cover">
          </el-upload>

        </el-form-item>
        <el-form-item label="课程价格">
          <el-input-number :min="0" v-model="courseInfo.price" controls-position="right" placeholder="免费课程请设置为0元"/> 元
        </el-form-item>

      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存并下一步</el-button>
      </el-form-item>
    </el-form>
    
  </div>
</template>

<script>
import course from '@/api/edu/course'
import subject from '@/api/edu/subject'


export default {

        data(){
            return {
              courseInfo:{
                  title: '',
                  subjectId: '',
                  subjectParentId:'',
                  teacherId: '',
                  lessonNum: 0,
                  description: '',
                  cover: process.env.VUE_APP_OSS_PATH + '/%E9%BB%98%E8%AE%A4%E8%AF%BE%E7%A8%8B%E5%9B%BE%E7%89%87/u%3D4172922785%2C422906043%26fm%3D253%26fmt%3Dauto%26app%3D138%26f%3DJPEG.webp',
                  price: 0
              },
              courseId:'',
              saveBtnDisabled: false,
              teacherList:[],//封装所有的讲师
              subjectOneList:[],//封装所有的一级分类课程
              subjectTwoList:[],//封装所有的二级分类课程
              BASE_API:process.env.VUE_APP_BASE_API
            }
        },
        created(){
          //获取路径下的id值
          if(this.$route.params && this.$route.params.id){
              this.courseId =this.$route.params.id
              this.getInfoIdCourse()
          }else{
              //初始话所有讲师
              this.getListTeacher()
              this.getAllSubject()
              this.subjectLevelOneChanged()
          }
    
        },
        
        methods:{
            //根据课程id查询信息 
            getInfoIdCourse(){
              course.getCourseInfoId(this.courseId)
                .then(Response => {
                  
                    this.courseInfo = Response.data.courseInfoVO
                    console.log(this.courseInfo.subject_parent_id)
                    this.getListTeacher()
                    subject.getAllSubject()
                      .then(Response => {
                        //获取所有的一级分类
                          this.subjectOneList = Response.data.list 
                          console.log(this.subjectOneList)
                          for(var i = 0; i < this.subjectOneList.length;i++){
                              var oneSubject = this.subjectOneList[i]
                              if(this.courseInfo.subjectParentId == oneSubject.id){
                                this.subjectTwoList = oneSubject.children
                                console.log(this.subjectTwoList)
                              }
                            
                          }
                      })

                })
            },

            //封面上传
            handleAvatarSuccess(res,data){
              this.courseInfo.cover = res.data.url
            },
            
            beforeAvatarUpload(file){
                const isJPG = file.type === 'image/jpeg'
                const isLt2M = file.size / 1024 / 1024 < 2

                if (!isJPG) {
                  this.$message.error('上传头像图片只能是 JPG 格式!')
                }
                if (!isLt2M) {
                  this.$message.error('上传头像图片大小不能超过 2MB!')
                }
                return isJPG && isLt2M
            },
            //点击某个一级分类出发change，出发显示对应二级分类
            subjectLevelOneChanged(value){
              // alert(value)
              for(var i = 0;i < this.subjectOneList.length;i++){ 
                  //每个一级分录
                  var oneSubject = this.subjectOneList[i]
                  //判断：所有一级分类id 和点击一级分类id是否一样
                  if(value == oneSubject.id){
                    this.subjectTwoList =  oneSubject.children
                    this.courseInfo.subjectId = ''
                  }
              }
            },
            //查询所有一级分类
            getAllSubject(){
              subject.getAllSubject()
                .then(Response =>{
                  this.subjectOneList =  Response.data.list
                })
            },
          
            //查询所有的讲师
            getListTeacher(){
              course.getListTeacher()
                .then(Response =>{
                  this.teacherList =  Response.data.items
                })
            },
            //添加课程信息
            addCourseInfo(){
              course.addCourseInfo(this.courseInfo)
              .then(Response =>{
                //提示
                this.$message({
                    type:'success',
                    message:'添加课程信息成功',
                }) 
                //跳转到第二步
                this.$router.push({path:'/course/chapter/' + Response.data.courseId})
              })
            },
            //修改课程信息
            updateCourseInfo(){
              course.updateCourseInfo(this.courseInfo)
                .then(Response => {
                   //提示
                this.$message({
                    type:'success',
                    message:'添加课程信息成功',
                }) 
                //跳转到第二步
                this.$router.push({path:'/course/chapter/' + this.courseId})
                })
            },
            saveOrUpdate(){
              if(!this.courseInfo.id){
                //添加
                this.addCourseInfo()
              }else{
                //修改
                this.updateCourseInfo()
              }
                
              
            }
        }

}
</script>

<style scoped>
.tinymce-container {
  line-height: 29px;
}
</style>